GAS-DISCHARGE T RAN SM IT-RECEIVE SWITCH 101 



If the ATR and the TR are designed to have the same value of Pg then the 

 values of 61 and 80 must be the same so that a relationship will exist between 

 F and T given by 



The input impedance Z to an ATR adjusted to the same gas discharge power 

 of a TR with a transmission of T is given by 



Z = j-4^ . (38) 



APPENDIX D 

 The Analysis of Leakage Power Data 



The section on receiver protection described the three components of 

 leakage power which were referred to as spike, flat, and direct coupling. 

 One may write down at once the followmg simple expression for leakage 

 power: 



Pfi = E.f + Prfi + F^To (39) 



where Pr is average leakage power 



Es is energy in a single spike 



/ is pulse repetition frequency 



Pp is flat power 



/ is pulse duration 



Pu is average magnetron power (averaged over the recurrence period) 

 and 



Td is direct coupHng insertion loss. 

 Experimental curves verifying the hnear relationships indicated by this 

 simple equation are shown in Figs. 40, 41, and 42. It is a straightforward 

 operation to deduce numerical values for the three TR box leakage param- 

 eters from the slopes and intercepts of these cur\'es. 



Equation (39) was written on the assumption that gas-limited flat power 

 and direct coupling power add linearly. If instead we assume that a phase 

 angle 6 exists between the two currents, we find: 



P« = E.f -f Prft + ToFm + 2VFrflTopM cos d (40) 



This of courss is identical with equation (39) except for the cos d term. If 

 cos 6 is not zero, we no longer expect a linear variation of Fh \vith /, /, or 

 Fm; the experimental curves demonstrate quite clearly that cos d must 

 vanish, hence d must equal 90°. 



